Attrition mill



M y '13, 193 A. SCH'UCHARDT 7 1,758,539

ATTRITICN MILL Filed April 2, 1929 IN rrzwz'am ATTDE NEYI Patented May 13, 193% siren r- AUGUST scnncrrannr, oi wrNonA, MINNESOTA ATTRITION lVIILL Application filed April 2,

My invention relates to grinding mills or devices also known asattrition mills of the type in which the grinding process takes place between two vertically mounted rotatable grinding elements also known as runner heads placed in predetermined parallel, close relation and rotated by separate power units.

One of these runner heads is provided with openings about its hub for the material to be ground to pass through and between the said grinding elements. My improvement consists mainly of a new and useful construction for facilitating the feeding materials into the grinding area and also improved mounting means eliminating the chatter or rattling of the said open runner head as hitherto made, said improvements being hereinafter fully set forth and illustrated in the accompanying drawing, in which,-

Fig. 1 is a front elevation of a grinding mill of the type in which my improvements are applicable, the central part of said mill being shown in approximately central ver-, tical section to. disclose the improved parts.

Fig. 2 is an enlarged view of. the central part of Fig. 1 showing certain modifications.

Fig. 3 is an end view of my improved seal ring and Fig. 4 is an elevation of the hand hole plate used with my device.

Referring to the drawing by reference numerals, 5 and 6 designate respectively left and right pedestals'mounted in alinement and on each is mounted a motor of which 7 is the left and 8 the right motor having extended 7 respective drive shafts 9 and 10 in alinement and their adjacent ends close together within the grinder housing 11. 7

Said housing has a bearing 1113 for shaft 10 and inwardly of this housing the said shaft 10 carries a circular grinding element or disc 12 hereinafter referred to also as the closed runner head. 13 is the other grinding element also referred to as the open runner head and mounted on the end of shaft 0 adjacent to the end of shaft 10 and within housing 11, the grinding process, of course, taking place between these two heads when they are rotated by their respective motors. The outlet means for ground material is not shown or included as a part of my invention,

1829. Serial Ito. 351,887.

my improvements being wholly in the means for ei'liciently feeding. material to and through the openrunner-head 13 and in a more efficient mounting ofthe shaft 9 at said open runner-head; V 7,

ll is a receiving hopper-mounted above and to'one side ofhousing 11 and opening into a housing 15, having suitable rotary means driven by a rotating shaft 16internally for even feeding of material downwardly to a downwardly directed flue 17 comprising the upper portion of a feeder pedestal P suitably mounted on base This pedestal has a vertical circular opening (designated P in Fig. 1) in spaced; parallel relation-to the open runner head13. Opposite said openingthe pedestal isformed as l? in conic-shape directed horizontallytoward head 13 and bored centrally for a removable bearing 18 (shown as a ball bearing). Obviously this bearing is thuslocated' as close as possible to the said head 13 and provides a bearing for shaft 9 in alocationclose to head 13 which'is thus held in rotatable but rigid position, a desired condition for same.

19 isa metal head seal ring concentric of and aflixed to the rear side of head 13 (as shown inFigs. 1 and 2), said ringbcing of approximately L-shape in crosssection with the base flange inwardly. 20 is a male seal ring with a circular flange 20? arranged to be fixed in concentric relation to and within the base of the'ring 19. ltearward from said flange this ring is flared outwardly and t er-- minates ina circular outside face arranged to fit within the-bore P of the feeder pedestal (as in F ig; 1). lnthe modified form of this male seal ring its large endcomprises a circular curved edge, as at 201*] in Fig. 2 and the opening P of the pedestal is correspondingly grooved, as P (Figf2) forfrictional retention of said outer part of the ring. Either type of this-ring may be held positively co n centric of the female ring 13 by means of a number of radial lugs 20L bored forcap screws or bolts 21 (Fig. 1) arranged to engage threaded adjacent parts of housing 11. The male ring wall flared outwardly as shown andjust described, provides an angular guiding means between which and the adjacent ion tapered pedestal bearing P an inclined passage P is formed, leading from line 17 and ,mentum to the grinding elements.

Some material not caught in this feeding action may drop down below'the' cone Pf but this maybe-obviated'by use o'fhorizontal fixed plates at each side of the cone (not shown). Such material maybe readily reached or any lower anterior partsin the pedestal made ac cessibleby a hand hole plate 22 shaped in arc'uate form' as shown in Fig. 4 to normally close the lower rear part'ofthe pedestal below i 7 its conic hub member P I have not illustrated any means for adustmentof the manner-heads, said means helng of well known construction and not constituting apart of this invention. For purpose of brevity anda read-ier understanding or the devicethe runner heads 12 and 13 may also betermed simply as milling heads. The iousing 11 ot courseis readily understood as to construction having a large aperture 11 A o concentric of and corre'sp'on'ding to the open- V ingfP in thefteed'er pedestal.

I claim: 1. In amillof'the' class described having a 7 pair of upright milling "h'eadsrotatable in V proximity to each other, each mounted on a rotary shaft and said -sha"-ftin alinem'ent a plurality of bearings supporting said shaft,

' a housing "about said "head's'and 'a 'feeder ped- V estal "adjoining said housing withan intake hopper in its upper part-at-an elevation above the milling heads; a female seal-ring fixed i concentrically on one of said"milling hea'ds nearest the feeder pedestaland of-Ls'h'ape in cross section and providing a circular collar, said head provided with a circular row of apertures flared out toward the "other head, said feeder pedestal provided with a vertical intake flue communicating with said hopper and inclined guide passage means leading downwardly direct from said liue'to the adjacent or'ou'ter side of the saidapertured milling head, said inclined guide-means comprises in the pedestal an integral horizontal hub formed with :conic exterior tapering toward and terminating at the hub of said open milling head, said conical *hub *bored centrally for theshait supporting said millin-g head and bearing means provided for said shaft within said bore and in proximity to the milling' head, and further guide means in approximatelyparallel relation to said conic face of-thehub, comprising a removably fixed made seal ring with a circular flange retained concentric Within the seal .ring of the open milling head, the major part of said male ring comprising a circular body flared outwardly from said flange toward the feeder pedestal, said latter pedestal provided with acir'cular aperture concentric of said milling head and said male seal ring to retain the outer edge of its flared body.

, 2. The structure specified in claim 1, said ou'ter-edge'ot the male seal ring being round- ,ed, saidapertured part of the pedestal formed with a 'seat for frictionally retaining said outeredge of the male ring.

In testimony whereof I affix my signature.

' AUGUST SCHUGHARDT. 

